Process of making skittle-grounds.



PROCESS OF MAKING SKITTLE-GROUNDS.

No Drawing.

To all whom it may concern:

Be it known that I, OTTO KARL ALBERT MANTI-IE, a subject of the German Emperor, and residing at Niederplanitz, near Zwickau, Germany, have invented a certain new and useful Improved Process of Making Skittle-G-rounds, of which the following is a specification.

My invention relates to processes of making smooth skittle-grounds and other facings containing asphalt.

It is well-known to make asphalt skittlealleys by boiling a mixture of asphalt, goudron, and sand, applying the boiled mixture to a bed of cement concrete, distributing it thereon so as to obtain a facing of a thickness suitable for the skittleground or facing in question and rubbing the facing with sand before it cools. The asphalt grounds made in this manner have what may be termed a rough surface which not only offers to the balls a not little frictional resistance and not seldom cracks, but also can be cleaned only with difliculty.

A primary object of my invention is to provide an improved process of making a skittle-ground or facing whose frictional resistance is reduced to a minimum, which is very flexible, forms an almost noiseless skittle-alley and can be readily and conveniently cleaned.

My process is carried into practice as follows :The asphalt mixture is first applied in the manner customary heretofore on a bed of cement concrete and rubbed with fine quartz sand, any superfluous sand being brushed away with a hair brush. The asphalt facing is then at once rubbed while it is hot with Portland cement and the brushing with the hairbrush is repeated. After the temperature of the mass has sunk to from 120 to 100 C. a light coating of wax is applied, whereupon the facing is powerfully smoothed with a planed block of beechwood the size of a fist. Owing to this treatment the grains of sand mixed with the asphalt and located at the surface thereof are pushed down and the asphalt mastic is brought more and more Specification of Letters Patent.

Application filed December 26, 1911.

Patented May 28,1912. Serial No. 667,931.

to the surface. This smoothing operation is continued until the asphalt mastic in combination with the applied layer of wax has a surface free from sand, this being obtained when the temperature of the mass is from 40 to 80 G., whereupon a second coating of wax is applied. After the mass has completely cooled the proper polishing of the ground is done with a very fine steel- Wire fabric which is preferably attached on a foundation of felt on a handy board. The purpose of this treatment is to grind away any grains of sand or unevennesses which may be present. 'If the asphalt facing is now smoothed again with the block of beechwood the desired smooth surface of the ground is obtained which requires to be only rubbed with felt in order that it may have a polish like that of marble.

I claim 1. The herein described process of mak ing smooth skittle-grounds and facings of floors and the like containing asphalt, which consists in coating a bed of cement concrete with a boiled mixture of asphalt, goudron and sand while hot, in rubbing quartz sand into the coating, in then rubbing Portland cement into the sanded coating, in thereupon coating the facing thus obtained with wax, and in subsequently polishing the waxed facing.

2. The herein described process of making smooth skittle-grounds and facings of floors and the like containing asphalt, which consists in coating a bed of cement concrete with a boiled mixture of asphalt, goudron and sand while hot, in rubbing quartz sand into the coating, in then rubbing Portland cement into the sanded coating, in thereupon coating the facing thus obtained with wax, in smoothing the waxed facing, in coating'the smoothed facing with wax, and in subsequently polishing the waxed facing.

OTTO KARL ALBERT MANTHE.

Witnesses RUDOLPH FRIcKE, LUDWIG LAVISCH.

Copies 01' this patent may be obtained for five cents each, by addressing the Uominissioner of Patents, Washington, D. G. 

